Page 192 - Template Tesis UTM v2.0

fracture showed that the premature delamination occurred at the layer interface

between E-glass with natural fibre caused by internal failure.

Quasi-static indentation test revealed that G2/B3/G2, G2/J3/G2 and G2/F3/G2

exhibited a higher energy absorption capacity than [G/B]3G, [G/J]3G and [G/F]3.
However, on the peak force, G2/J3/G2 exhibited the highest value as compared with

G2/B3/G2 and G2/F3/G2. The most noteworthy hybridisation is the combination of E-

glass with basalt fibres which increased energy absorption by 73.4 % and peak force
by 14.9 %. The specific energy absorption and specific peak force of E-glass/jute

exhibited the superior properties, meaning that the combination between E-glass and
jute fibres could be a prospective material in developing high resistance static loading

structures.

For the low velocity impact, the linear increase of force - time histories for

G2/B3/G2 and G2/F3/G2 were higher than their IC sequences, while E-glass/jute showed
a contradict pattern. The ultimate specific impact peak force was recorded in a hybrid

composite of [G/J]3G while G2/F3/G2 recorded the highest value of specific impact

energy absorption. It is interesting to note that the pure jute has better energy
absorption capacity compared to E-glass/jute with the difference about 2.8 %.

From SHPB results, pure basalt recorded the lowest impedance ratio ( =

0.3 %), meaning that almost of the incident waves were transmitted through the
specimens. Present study revealed that the higher the strain rates imposed on the tested

specimens, the higher the maximum stress exhibited by the specimens. However, it

was contradicted with the maximum dynamic failure strain. The G2/B3/G2, G2/J3/G2
and G2/F3/G2 recorded a higher value of maximum dynamic compressive stress

compared to [G/B]3G, [G/J]3G and [G/F]3G within the range strain rates of 700 - 850,
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1125 - 363 and 2214 - 2350 s . It was also found that G2/J3/G2 and G2/F3/G2 had
increased the dynamic maximum compressive stress by 42 and 56 %, respectively
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compared to those of pure composite laminates. Within the range of 755 to 850 s , the
G2/B3/G2, G2/J3/G2 and G2/F3/G2 exhibited the specific peak stress of 176.7, 109.2 and
136.9 MPa. These peak stresses increasing about 6.6, 20.4 and 21.2 MPa, respectively

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when the applied strain rates were increased up to 1363 s . The increment of dynamic

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